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Java > Open Source Codes > org > objectweb > jalisto > se > storage > raf > DbByteArrayOutputStream


1 /*
2  * Jalisto - JAva LIght STOrage
3  * Copyright (C) 2000-2005 Xcalia http://www.xcalia.com
4  *
5  * This library is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Lesser General Public
7  * License as published by the Free Software Foundation; either
8  * version 2.1 of the License, or (at your option) any later version.
9  *
10  * This library is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  * Lesser General Public License for more details.
14  *
15  * You should have received a copy of the GNU Lesser General Public
16  * License along with this library; if not, write to the Free Software
17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
18  *
19  * Xcalia
20  * 71, rue Desnouettes
21  * 75014 Paris - France
22  * http://www.xcalia.com
23  */
24 package org.objectweb.jalisto.se.storage.raf;
25
26 import java.io.*;
27 import java.util.ArrayList JavaDoc;
28
29 public class DbByteArrayOutputStream extends ByteArrayOutputStream {
30     private DbByteArrayOutputStream() {
31         super();
32         output = new DataOutputStream(this);
33     }
34
35     public synchronized void writeTo(DataOutput dstr) throws IOException {
36         dstr.write(super.buf, 0, super.size());
37     }
38
39     public void writeDatas(byte[] datas) {
40         if (super.buf.length < datas.length) {
41             super.buf = datas;
42         } else {
43             System.arraycopy(datas, 0, super.buf, 0, datas.length);
44         }
45         super.count = datas.length;
46     }
47
48     public byte[] getDataToWrite() {
49         return super.buf;
50     }
51
52     public synchronized void reset() {
53         super.reset();
54         instances.add(this);
55     }
56
57     public DataOutputStream getOutput() {
58         return output;
59     }
60
61     private DataOutputStream output;
62
63     /** *********************************** STATIC **************************************************** */
64
65     private static ArrayList JavaDoc instances = new ArrayList JavaDoc();
66
67     public static DbByteArrayOutputStream getInstance() {
68         if (instances.isEmpty()) {
69             return new DbByteArrayOutputStream();
70         }
71         try {
72             return (DbByteArrayOutputStream) instances.remove(0);
73         } catch (ArrayIndexOutOfBoundsException JavaDoc e) {
74             return new DbByteArrayOutputStream();
75         }
76     }
77 }
78
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